Anyone know of any free apps to track what time to reach/leave work?

My manager just changed and he's giving me a hard time about what time I get to work, so I was wondering if anyone knew of any FREE apps that I can use to basically "clock in" and "clock out" when I get to or leave work. This would just be for my own record in case he makes another comment. So far all the apps I've been able to find are paid, but not sure if there's something I missed. Thanks!!

EDIT: I realized my Google Maps timeline tracks this automatically! Since I have my timeline turned on. So I don't need to do anything actively. Thanks for all the ideas though!